Pulverizing machine



C. A. D ORN June 5, 1923.

PULVEHI'ZI'NG mcnxya Filed 00.11. 15 4 Sheets-Sheet 1 Glades/4.00272June 5, 1923.

Y C.A.DORN.

PUbVERIZiNG MACHINE Filed Oct. 15, 1921 4 Sheet Sheet 2 czar/$4170;

'Janefs, 1923. 4 1,457,693

- C. A. DORN PULVERIZING MACHINE Filed Oct. 15, 1921 4 Sheets-Sheet 4 Igmwm Cadqs 94.001'12 '1 Patented June 5, 1923. p

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1 U D- STAT S 1,457,693 PATENT OFFICE.

' CHARLES A. Donn, or CANTON, omo.

IULVERI ZING MACHINE.

Application flied October 15, 1921. Serial No. 507,982.

a horizontally positioned twin cylinder case and to pulverize the coalby .a cyclonic action whereby the particles of the material are powderedby impinging one anotherin a se mental openin between the cylinders.

tained by the use of a. case forming two the communicating flanges inthe case between the heaters, and a on line Il--II,

,tioned si e by si he objects of t e improvement are atparallelcylindric chambers havin a ngitudinal communicating cylindrica segmentopening between the cylinders, each cylinder having a series of heatersrotating in the same irection creating a cyclonic action in openmg. andbafile central inlet hopper at one end of the case and centrifugalimpellersdrawlng the pulverized mater '11 from the other end of eachcylinder for discharging the same therefrom.

A preferred embodiment of the invention is illustrated in theaccompanying drawings, forming part hereof, in which- Figure -1, is aplan section of the machine in the horizontal plane of the axes of thecylinders;

Fig. 2 a 10m itudinal elevation section,

i 1' Fig. 3, a tra i isvirse' section on line III-III, Fig. 2; and

Fi 4 a transverse section on line IV-iV, Fig. 2.

Similar numerals of reference refer to similar parts throughout theseveral figures of the drawings.

The case 1 of the machine is in the form of two elon ated c lindershorizontally posicl; with a; longitudinal open ing 2, between them. Aremovable lining 3 of hardened metal is preferably provided in the case,upon which a series of mwardly projecting annular flanges 4 are formedat spaced intervals forming the annular channels 5 between them, whichflanges extend entirely around the inner face of the cylinders,excepting only at the longitudinal opening 2 formed by interceptingsegments 0 the cylinders, which is unobstructed.

Axial shafts 6 are mounted in each cylinder by means of bearings 6 atthe ends of the case, and upon each shaft is keyed a series of hubs 7from which project radial beater arms 8, the ends of which extend intothe annular channels between the flanges 4.

The face 9 of each beat-erarm is slightly inclined in the direction ofits width so as to deflect'the material toward the rear or outlet end ofthe-cylinder, and thelength of the arms is such that'they pass adjacentto, without striking the arms in the adjoinmg cylinder.

The shafts operate in the same direction by meansof separate motors, sothat the adjacent ends of the heaters pass each other in oppositedirections on each side of thelongitudinal opening 2, between thecylinders', thereby creating a cyclonic action therein.

Coal orother material to be pulverized is received through a hopper 11and a central port 12 controlled by anadjnstable gate 13 m the upperpart of the forward end ofthe machine; and the material may'be fed intothe hopper from a sup ly reservoir 14 by a screw conveyor 15 disc argingupon a con-. veyor belt 16 delivering into the hopper 11, andthe'material preferably passes through a magnetic comb 17 for extractingmetallic substances therefrom.

The rear end of the case is shaped toform chambers 18 and 18' havingcentrifugal fans'19 mounted on the shafts 5 therein, and each chamberhaving a centralannular inlet opening 20 around the shaft in its rearwall and a peripheral outlet opening 21 and 21' communicating with adischarge pipe 22 leading to a consuming furnace or other place of useor storage; there being an axial port 23 in the rear wall of the casefor each fan, and an adjustable damper 24 for each port. I

An adjustment of the gate 13 controls the amount of coal 'and air whichmay enter the forward end ofthe machine and an adjustment of the damper24 regulates the amount of additional air which may enter the rear sideof the fan to mix with the coal dust delivered to a furnace, therebycontrolling combustion therein.

In the operation of the machine, the material' to be pulverized is fedthrough the hopper 11 and the port 12 into the forward end of themachine in the median line there-' of, at the forward end of thelongitudinal opening 2 between the cylinders, where it is impinged bythe first set of heaters in one or the other cylinder and throwncentrifugally outward thereby into and along the first annular channelwhereby it is crushed or. .reduced to a certain extent.

The inclined faces of the heaters urge the material rearward and some ofit finds its waythrough the opening inside the flanges 4 into the pathof the next set of heaters, wherein p the centrifugal action furthercrushes and reduces the -material.

.When the material is carried around the cylinder back to thelongitudinal opening between the same, the intervening currents causedbythe opposite movement of the heaters on opposite sides of the opening,creates a cyclonic movement ofthe material which is thereby ground uponitself; which centrifugal and cyclonical actions are repeated by thesuccessive sets of heaters until the material reaches the rear end ofthe machine.

As fast as the material is reduced or pulverized to a fine powder itfloats moreprless in the air throughout-the entire cavity of thecylinders, and is subject to the suction created by the centrifugalfans, and is drawn through the inlets thereto at the rear endsof thecylinders, and is discharged through the pipe 22- r Although aconsiderable portion of the material is crushed'by the action of theheaters and the walls of the cylinders, the greater portion of thepulverizing action is accomplished by the cyclonic action'in thelongitudinal segmental opening between the cylinders, thereby saving theheaters and the walls of the cylinder from the greater abrading actionto which they will be subject if they'did all the work of reducing thematerial.

Furthermore the larger particles of the material are thrown into thechannels between the fianges 4 and are thereby retarded so that only thesmaller-51nd lighter particles move rearward in the machine and'only thefinely pulverized or powdered material is drawn and discharged therefromby action ofthe centrifugal fan. a

It is evident that the heaters in the respective cylinders maybe'operated at the same or at different speeds without departing fromthe spirit of the invention; and it has been found in practice that coaland other like materials need not he previously dried for beingpulverized in the improved machine.

I claim:

.1. A pulverizing machine compr sing a horizontal twin cylinder casehaving a longitudinal'segmental opening between the cylinders, rotatingheaters in the cylinders creating a cyclonic action in the segmentalopening, a material inlet means at the forward end of the case andsuction means at the rear end thereof drawing and discharging pulverizedmaterial therefrom.

2. A pulverizing machine comprising a horizontal twin cylinder casehaving a longitudinal segmental opening between the cylinders, rota-tingheaters having" rearmwrdly inclined faces in the cylinders creating a'cyclonic action in the segmental opening, a material inlet means at theforward end of the case and suction means at the rear end thereofdrawingand discharging pulverized material therefrom.

3. A pulverizing horizontal twin cylinder case having a longitudinalsegmental opening between the cylinders, a series of internalannularflanges in the cylinders forming annular channels therein on each sideof the opening, rotating heaters in the cylinders creating a cyclonicaction in the segmental opening, a material inlet means at the forwardend of the case and suction means at the rear end thereof drawing anddischarging pulverized material therefrom.

4. A pulverizing machine comprising a horizontal twin cylinder casehaving a .ongitudinal segmental opening between the cylinders, rotatingheaters in the cylinders creating a cyclonic action in the segmentalopening, a gate controlled material inlet means at the forward end ofthe case and machine comprising asuction means at the rear end thereofdraw-- ing and discharging pulverized material therefrom.

5. A pulverizing machine comprising a horizontal twin cylinder casehaving a longitudinal segmental opening between the cylinders,. rotatingbeaters in the cylinders creating a cyclonic action in the segmentalopening, a material inlet means at the forward end of the case andsuction means at the rear end thereof for drawing and dischargingpulverized material therefrom, there being a damper controlled port inthe suction means.

6. A pulverizing machine comprisin a case forming two parallel cylinderswit a longitudinal opening between them, a series of internal annularflange, in the cylinders forming a series of annular channels therein oneach side of the opening. heaters having rcarwardly inclined faces inthe cylinders rotating in the same direction for creating a cyclonicaction in the longitudinal openings, said case having a. material inletopening at its forward end and suction means at the rear end thereof fordrawing and discharging pulverized material.

7. A pulverizing machine comprisinr a case forming two parallelcylinders with a longitudinal opening between them, a series of internalannular flanges in the cylinder case forming twoqparallel cylinders witha forming a series of annular channels therein 10 'tudinal openingbetween them, heaters on each side of the opening, heaters having infiie cylinders rotating in the same direc- 15 rearwardly inclined facesin the cylinders tion. for creating a cyclonic action in the 5rotatingin the same direction and extending longitudinal opening, saidcase having a into the annular channels for creating. a material inletopenin at its forward end, cyclonic action in the longitudinal opening,and separate fans att e rear end of the case said case having a materialinlet opening at lmv n inlets Opening from the respective :0

its fol'ward end and suction means at the cylin ers and'outletsdelivering into a com- 10 rear end thereof for drawing and dischargmondischarge pipe ing, pulverized material therefrom.

8. A pulverizing machine comprising a CHARLES A. DORN.

